Drilling attachment for riveting machines



May 27, 1952 F. A. BOYLE 1 DRILLING ATTACHMENT FOR RIVETING MACHINESFiled 001;. 4, 1949 4 Sheets-Sheet 1 IN V EN TOR.

Frank A. Boy/e May 27, 1952 F. A. BOYLE DRILLING ATTACHMENT FOR RIVETINGMACHINES 4 Sheets-Sheet 2 Filed Oct. 4, 1949 y 7 2 F. A. BOYLE 2,598,106

DRILLING ATTACHMENT FOR RIVETING MACHINES Filed Oct. 4, 1949 4Sheets-Sheet 5 "Hul- I N VEN TOR.

an k A 50 la igw F. A. BOYLE DRILLING ATTACHMENT FOR RIVETING MACHINESMay 27, 1952 4 Sheets-Sheet 4 Filed Oct. 4, 1949 INVENTOR.

frank A. 50 la Patented May 27, 1952 UNITED STATES PATENT GFFECE-DRILLING ATTACHMENT FOR RIVETIN G MACHINES Frank A. Boyle," San Diego,Calif., assignor to- Gonsolidated Vultee Aircraft Gcrporation, SanDiego, Galifi, a corporationof- Delaware- Application'October 4, 1949,Serial No. 119,469

are-required to rivet metal'sheets or workpieces,

particularly sheets or work pieces of aluminum and aluminum alloys, toemploy automatic punching and riveting machine. With the development ofthe trend toward higher speed airplanes, which embody heavier andheavierskins,

the combined thicknesses of parts to be riveted reach a point where theautomatic punching. and riveting machines cannot effectively andefiiciently perform their function. It is therefore generally the objectof" this invention to provide an attachment for an automatic riveting.mae chine which will adapt it for use with work pieces havingrelatively. greater combined thicknesses than were formerly encountered.The attachment will further adapt the machine for perforating andriveting material, such as steel; which normally is too thick and heavytopunch by conventional means;

The invention has for a principal object the provision, in a rivetingmachine of the character above described, of an improved form ofdrilling,

from, to maintain the individual parts of the work piece in" positionfor" the performance of the riveting operation.

Another object of the invention resides in,

the provisionof a novel drive system for effecting operation of the"drill attachment.

Still another object of the invention lies in providing automaticallyoperative means associated' with the drill attachment to" providecurrent of air for cleaning the drilled openings" of dust and chipscreated'by'the drill;

Another object ofthe'invention isto provide a drilling attachment havingan improved? form of gage device for determining the depth; of theperforation made by' the cutting tool;

A' further object of the invention isto provide in a, machine. of'thecharacter described an improved holding attachment adapted during thedrilling operation to press the juxtaposed work pieces firmly intoengagement with one another. to prevent metal particles fromsiftingbetween the workpieces while-the drill is acting upon. them.

Another object of the invention isto provide a drilling. attachmentwhich is generally of new and improved construction, may. bemanufactured at a comparatively low cost and effectively and efficientlyfulfills its intended purpose.

Other objects and features of the present invention will be readilyapparent to those skilled in the. art from the followingspecificationand appended drawings wherein is illustrated a preferred. formof theinvention, andin which:

Figure 1 is a general perspective view of a rivetingmachine embodyingthe drilling attachment in accordance with thepresent invention;

Figure 2 is an enlargedfragmentary view, in side elevation, showing thedrilling attachment in operative position;

Fi'gure3 is an enlarged'fragment'ary view, but in front elevation,showing the drilling attachment in operative position;

Figure 4'is a-perspective viewjof' the stop assembly' for the aircylinder piston;

Figure 5 is a perspective view of the cutting tool;

Figure dis a perspectiveview of the gaging means for'the drillingattachment;

Figure '7 is. a side elevational view of the drill tion, illustratingthe air motor for driving, the

drilling unit;

Figure 11 is a fragmentary view, partly in elevation and partly insection, of the air flow controlling apparatus for determining theoperation of the drive motor of the drilling'unit'a nd for governing theflow of blast air for clearing" away drill chips;

Figure 12 is a perspective view of the cam actuator member which ismovable to operate the air flow controlling apparatus;

Figure 13-is a fragmental view, in perspective,

of the operating mechanismfor the cam; actuator member;

Figure 14 is a fragmental view, partly in-section, of the anvil assemblyshowing the pilot and locating pin;

Figure is a fragmental view, partly in section, of a detail of the anvilassembly;

Figure 16 is an elevational view of the work clamping assembly; and

Figure 17 is a fragmental perspective view of the clamping arm.

The drilling attachment of the present invention is contemplated for usewith those machines which are adapted automatically to insert rivets inperforations formed in the material to be riveted and to complete theriveting operation by heading the rivets. Embodied in such machines is areciprocating pressure plunger-rivet set which will be operative duringboth the perforating and riveting operation to assist in the performanceof these operations.

The automatic riveting machine employed may be of any well knownconstruction, such as the Erco Automatic Punching and Riveting Machine,Model 1002 made by the Engineering and Research Corporation ofRiverdale, Maryland, and embodying the principles of U. S. Patents1,990,998 and 2,056,559. The punch or perforating mechanism of the abovemachine will be supplanted by the drilling attachment of the presentinvention. Since it is understood that this machine is to be regardedmerely as illustrative of the type of machine with which the drillingattachment of this invention may be used the machine will therefore bedescribed only with such particularity as is necessary to anunderstanding of the invention.

An automatic riveting machine of the type above mentioned, is shown inthe drawings and is there designated generally by the numeral It. Thismachine H3 is adapted to perform, sequentially, a series of operations,namely, perforating the work to be riveted, automatically feeding rivetsinto the perforations formed and then heading the rivets, and themachine It! will perform these various operations without there beingany movement of the work between operations.

The riveting machine |B normally comprises a generally C-shaped yoke orframe H of relatively massive size supported in up-right position by anintegral base or pedestal portion H2. The yoke comprises verticallyspaced apart arms or jaws l3 and I4, which jaws are of substantiallength to effect a long work receiving throat in order that work piecesof considerable width may be accommodated by the machine H].

To the upper yoke jaw i3 is suitably afiixed a drilling mechanism |5, arivet holding assembly Hi and a reciprocating pressure applying shaft orplunger H, which elements accomplish the operations of perforating thework piece and of feeding the rivets into the perforations. The lowerjaw l4 mounts an anvil assembly H! which is operative to support thework piece and to effect heading of the rivets inserted into theperforations.

The drilling mechanism |5 comprises a drilling unit 2| supported by aswinging arm 22 which is secured, at its upper end, to a rotatable andreciprocable shaft 23 suitably mounted in yoke jaw Hi. The rivet holdingassembly l6, positioned adjacent the drilling unit 2|, is ofconventional construction and comprises a usual rivet shoe 24 carried bya swingable support member or arm 25 which in turn is mounted, at itsupper end, on a rotatable and reciprocable shaft 26 suitably supportedby upper jaw 13. The rivet shoe 24 serves to support rivets therein,which are received from a rivet tube 2'! and to deposit such rivets inperforations made in the work piece by the drilling unit 2|. Theswingable supporting arms 22 and 25 are suitably mounted in upper jaw |3of machine In and are controlled by suitable mechanisms embodied thereinso as to present the drilling unit 2| and the rivet shoe 24 in alternatesequence below the reciprocating plunger H for cooperation therewith.The drilling unit 2| and the rivet supporting shoe 24 are adapted tomove pivotally and in unison on the completion of each perforating andeach riveting operation. The means and mechanism provided by machine ||lfor mounting the shafts 23 and 26 to the upper jaw l3 and for effectingtheir simultaneous rotative movement to move the drilling unit 2| andthe rivet shoe 24 in unison are conventional and well known to thoseskilled in the art and there is no need, therefore, for a particularizeddescription to be made of such means and mechanism.

Figures 2 and 3 show the drilling unit 2| located in operative positionupon a work piece 28, being held thereupon under the pressure of theplunger The plunger ll is suitably mounted in upper jaw 13 of machine l8so as to have a reciprocating movement. In such movement plunger H isadapted to engage and carry the drill unit 2| downwardly toward the workpiece, in a manner hereinafter to be more fully described, and maintainit thereupon until the drilling operation is completed. Thereafter theplunger l! is retreated and the drilling unit 2| returns to the positionof Figure 1, after which the supporting arm 22 for the drilling unit 2|and the supporting arm 25 carrying the rivet shoe 24 swing or rotate inunison and exchange places beneath the plunger Rivet shoe 24 is then inposition to be engaged by plunger IT, in its next longitudinal movement,to be carried thereby to the work piece 28 to cause a rivet to beinserted into the hole formed for its reception by drilling unit 2|, theplunger acting as a rivet set, maintains pressure on the rivet until itis headed upon the anvil assembly l8. After the riveting operation theplunger H and the rivet shoe 24 both return to their upper position andthe machine is then ready for the drilling unit 2| to be swung beneaththe plunger I! to begin the next series of operations. The purpose ofthe reciprocating plunger thus is to assist in the performance of boththe drilling operation and the rivet inserting and rivet headingoperation.

For actuation of the reciprocating plunger l1 there is provided a usualair cylinder 3| mounted on the upper jaw I3. The air cylinder 3|contains a reciprocable piston 32 adapted to be moved downwardly by airunder pressure introduced through a port (not shown) into the aircylinder above the piston 32. A piston rod 33 is connected to piston 32and extends to either side thereof. The portion 34 of the piston rod 33which extends downwardly from piston 32 projects out of the lower end ofthe cylinder 3| and is adapted to have the plunger suitably secured toit. A spring 35 located within the cylinder above the piston 32 issuitably connected to the upwardly extending portion 36 of piston rod 33and is adapted to be compressed upon the downward movement of the piston32. Spring 35 expands, on release of the air pressure applied to piston32, to return the piston 32 to its rest position and carry the plungerupwardly with it and thereby relieve the pressure being applied to thedrilling unit 2| or the rivet sho 24,. whiche er hap n t be n e easem nw th'znlunee The su po t Z2. Q t d llin unit :2! and the su po ar car yig the vet sh e 2e. r ac ad pte normal y t occupy a po i i n ye eallv sac d from the anvil assembly [8 and the worl resting thereupon. Usualspring means, not shown. ar r v de Wit i up r oke l w 3 fo ope at on ithhe recip ca ha ts .3 and i which espec ively a ry the su rt a s 22 and"2-5. These. spr n m a s co tinually xe t the r bias to ma tain theshafts 3 and 26 n thei upp r posit o so that movement of the supportarms 22 a d downwardl b he p u er ll w ll be accomn shedagainst thefierc of t ese spri means. Whenplun er If! i wi hdrawnby piston 32 thsupp rt arms 22 and 2.5 are moved upw rdly by he sha ts .23 an 25. whichautomati ally are returned to their up e position. under the b as ofheir cooperatinsreturn spring means.

Introduction of air under pressure to the air cylinder 3 l andsequencing actuation of the, drillingunit supportarm 22 and the rivetshoe sup: port arm .25 are controlled, in usual manner, remotely from aconventional foot operated control member 37, which embodies a pluralityof air valves v(n t shown) a tu ed indi id y y anurnber of foot pedals39. The foot operated c ntrol member 31. throu h it pe al ac uat airvaIVes Qverns the feedi g of compressed a received from an outsidesource of supply (not shown) through an air lead 38 to effect the opat nof th dri n unit 15,. th ri upport n ass mb y l6 and the reci catin p unor H. A pair of air leads ii and 42 connect the foot operated controlmember 31- and a conventional shift cylinder assembly 43 which affordsthe pDWer for operation of theair cylinder 3!. The shift cylinderassembly 43 is adapted to opcrate a conventional cable and pulleyarrangement 4 4 to actuate appropriate linkage (not shown) which willeffect rotative movement of shafts 23 and 28 to pivot the drilling unit2% and rivet shoe 24 so that, alternately, eachoc- L cupies a positiondirectly beneath reciprocating plun er ll to enable movement thereby.

An air lead 4 5 channels air from the main air l ad 3,3 to suitablemechanism, hereinafter to be described, which operates the drill unit2!.

Suitable connections are provided between air lead .45 and a usualregulator valve 46 and a usual master control valve 4;?- for feeding airto these valves. The regulator valve 48; provides air. under desiredpressure to the anvil assembly l 8;,,for use thereby in the support oftheworl; piece. The master control valve Ill connects throughair'lead 50to the air cylinder 3} to provide. the power for operation of the piston32 and to exhaust the air from cylinder. 3!. The pulley and cablearrangement 4}! through linkage, now shown, controls the operation ofthe master control valve 47 to determine theperiods and speed of feedingand of exhausting air from air. cylinder 3| during the drilling andrivet setting operations.

It is here particularly emphasized that the details of construction ofthe air cylinder H, the support arms 22 and 2 5-, the structure foreffecting rotation of these arms, the main control valve 41, theregulator valve 46, the shift cylinder assembly 43, the foot operatedcontrol member 33!, and the arrangement and operation of such elementsform no .part of the present invention. These. elements are, the.principal standard w rldne parts of a eemmercia ly and ab e automatirive n -machine. in he. machi e employed herein i well known to tho skll d n the a t is notrn ces ary to d scr be i n ny u her eta t an has ben done for a read unde standin of ts co stru tion d operat on- .Thedrill unit 21, in accordance with the present invention, comprises, asbest shown in Figures 1, Band 9, a composite ear housing 5| formed ofupper and lower body portions 52 and 53, which aresecnred one to theother .by screwsfi l. Each of the body portions .52 .and .53. areprovided with a plurality of recesses 55 formed in a row therein;

* the. recesses 55. of upper body portion 52 are adapted to align withthe recesses 55 of thelower body portion 53; when the body portion 152and 53 are .ioined tonne another to form a series of.threelongitndinally spaced gear chambers 5.6, 57 :and .158 with thecenter chamber .51 having intercommunication with the ,end chambers 56.and .55.

A gear train 59 .is provided'within housing 5! and comprises a drivegear6.1 which meshes. with i an :idler gear .62 which in turn meshes with adriving gear .63. The drive gear 6.! located within gear chamber 156 andis secured to .or formed integral with shaft 6'4, which shaft isjournalled at each end by being mounted in spaced ball bearing journals.675 and '56 provided in chamber 56. The idler gear .62 is disposed ingear chamber 5,? and is secured to orformedintegral with a shaft 517;. Apair of spaced roller bearings .63 and 6.9 in chamber- 51 journal theshaft 6.1. The driving ,gear- 63 is positioned in the third gear chamber58 and also is secured to .or formed integral with a shaft ,7]. Shaft 'His mounted for rotative movement by being journalled in ball bearingjournals l2; and E13, disposed on either side of driving gear 163 andlocated in .gear chamber 58,.

.Shaft ,H .for driving gear 63 has one end thereof extending through anopening in the base of lower body portion 53, and isexternally threadedat this end as indicated at M. A cutting tool E5 is adapted to besecured to the shaft H .for actuation thereby. This cutting tool [5 maybe of any. selected type, diameter and length and for purpose ofillustration of this invention is herein shown as a combinationcountersink and drill member. This member 15 is positioned belowdriving-gear .63 and in axial alignment with shait ii and comprises acylindrical shank l6, having at one end an internally threaded bore 11and at the opposite end a conical countersinking-pqr tionlfi comprisingan annular series of equidistantly spaced downwardly and inwardlyinclinedtcutting. edges 79., and projecting below and from the.countersinking portion [8 is a drilling portion 8!. having generallylongitudinally extending cutting edges 82.

The. externally threaded end 74 of shaft 'il is received withininternally threaded bore 17- to connect the combination countersink anddrill member 15 to. the gear train '59 to be powered thereby.

A ing means fidisgpm il eli o e er i ing the depth of; the hole and thedepth of the countersinkmade by. the cutting; tool '15. This gagingmeans 83; comprisesa internally threaded ring 3,4 having its upper endcastellated to provide an, annular series of equidistantly spacedupstanding teeth 86. Acylindricalhelicalspring 81 having :a;,dia1 netergreater than thatof-ring 84 is. secur.e .as eld n tQn nd.- o the ring84. The opposite end of the spring 81 is welded to the periphery of aperforated annular plate or washer member 88 and positions the latter sothat the opening 83 therethrough is disposed axially aligned withcutting tool I5 to permit the passage of the cutting edges thereof. Thewasher 88 is adapted to lie upon the upper surface of the work piece insurrounding relationship to the area thereof which is to be perforatedand is of value in preventing marring or scratching of the skin surfaceby drill chips created in the drilling operation. The cylindrical springalso has a tendency to prevent the drill chips from flying freely about.The coils of the spring 81 present themselves in the path of the drillchips and will block or hinder the passage of most of the chips andconfine them to the area defined by the diameter of the spring 81. Twopairs of diametrically opposed projections SI extend from the lower end92 of the ring 84 toward the washer 88 and, upon downward movement ofhousing i, are engageable with the upper surface thereof to constitutestop means which assist in determining the advance to be made by thecutting tool in the perforating operation, as will be described.

Operative connection of the gaging means 83, to the gear housing 5| isafforded by an externally threaded annular flange or collar portion 93provided depending from lower body portion 53 and encircling the cuttingtool 15. Ring 84 by reason of its threaded engagement with collar 33 canbe axially moved thereupon in either direction to adjust the position ofgaging means 83 relative to the cutting tool I5 and thereby determinethe amount of movement available to the cutting tool '15. The outerperiphery of the ring 84 is preferably knurled for ready gripping andeasy manual movement. A leaf spring 94, secured at one end, as bywelding, to the exterior surface of lower body portion 53 projectstherefrom to position its free end 95 between two adjacent upstandingteeth 86 so that teeth 86 and free spring end 95 cooperate to effect anindexing means. The leaf spring 94 exerts its bias to hold the free end95 thereof normally between two teeth with sufficient force that thering 84 will be effectively maintained in the desired adjusted positionon collar 93 and inadvertent movement thereof is avoided. Manualrotation of the ring 84 to change the amount of advance of the cuttingtool 15 will force the free spring end 95 out from between its restbetween adjacent teeth and when the ring 84 has been adjusted to adesired position the spring end 95 will snap into position between apair of teeth to lock the ring 84 in place. 7

The drill unit 2I is held in operative position on machine H) by theswingable supporting arm 22. The supporting arm 22 is formed with acompression collar 96 at its lower end which is adapted to fit over andencircle an annular flange 51 upwardly extending from upper body portion52 of gear housing 5!. A screw, not shown, is provided on thecompression collar 96 to effect tightening thereof upon the flange 91whereby the housing BI is rigidly aifixed to supporting arm 22. Anexternally threaded adapter 08 is removably fitted into a threaded bore99 prc,

vided in annular flange 9'! and lies in axial alignment with cuttingtool I5. The adapter 98 has a recess IOI in its upper end which receivesthe end of the reciprocating plunger-rivet set Il which carries thedrill unit 2| into operative position upon the work piece. The entranceto the recess IOI is chamfered, as shown, for easy access of plunger IT.The adapter serves, in addition to connecting the plunger I! and thedrill unit 2| for common movement, to maintain concentricity andalignment of the cutting tool I5 and the locating device of the anvilassembly I8, to be described.

To drive the cutting tool I5 there is provided an air motor I02operatively connected to the gear train 59 through a drive shaftassembly N13. The drive shaft assembly I03 comprises a tubular memberI04 into which is telescoped, for slidable movement, a rod element I05.The tubular member I04 is connected to a rotatable drive shaft I06provided by the air motor I02 by means of a universal joint I01 wherebyro tative movement can be provided to the drive shaft assembly I03. Therod element I05 is joined to the gear train 59 through the medium of asecond universal joint I08, as best shown in Figure 9. The universaljoint I08 comprises a body portion I09, suitably secured to the end ofrod I05, having spaced, downwardly extending arm portions III. A secondbody portion II2, having an internally threaded socket II3 providedtherein and spaced upstanding arm portions H4 at its upper end which liedisposed adjacent the arm portions I I I and at right angles thereto. Apivot pin H5 is carried by spaced arms H4 and extends therebetween. Asecond pivot pin II6 supported by the spaced arms III is adapted toextend through an opening (not shown) in the pivot pin II5 to effectthereby a pivotal connection between the two body portions I09 and H2. Aspacer 1, formed of metallic material such as steel, is disposed in thearea between the pairs of spaced arms III and H4. The pivot pins H5 andH6 are passed through spacer II! which serves to prevent slippagebetween the pins.

One end of shaft 64 of drive gear BI extends through an opening in thetop of upper body portion 52 and carries external threads thereon, asindicated at II8. This threaded end II8 is adapted to fit intointernally threaded socket I I3 to complete the connection between thedrive shaft assembly I53 and the gear train 59. Universal joint I0!embodies a similar pivotal arrangement as is incorporated in universaljoint I08 and effects an operative connection between the tubular memberI04 and the rotatable air motor drive shaft I06 to provide rotativemovement of the drive shaft assembly I03. This rotative movement ofdrive shaft assembly I03 causes shaft 64 to rotateto drive its gear GI,which actuates idler gear 62, the latter in turn actuating driving gear63 to rotate the cutting tool I5, carried by shaft ll, to enable it toperform the perforating operation when brought to the work piece.

The air motor I02 which actuates drive shaft assembly I03 is ofconventional construction, and comprises, as best shown in Figure 10, acasing I2I having a usual air vane assembly I22 suitably supportedtherein for rotative movement when air under pressure is introduced intothe casing I2I. The air vane assembly I22 is suitably connected througha usual reduction gear arrangement I23 to actuate the drive shaft I06which is connected by universal joint I01 to the drive shaft assemblyI03. A valve assembly I24, best illustrated in Figure 10, is providedfor controlling the feeding of air to the casing I2I to run air motorI02. Valve assembly 124 comprises a housing I25 afiixed to the exteriorof casing IZI as by welding, with communication between the interior ofhousing I2I and housing I being afforded by a tubular member I25. Anadapter I21 is threaded into the top wall of housing I25, extends thelengththereof, and has a longitudinal air passage I28 provided therein.Passageways I3I interconnect the air passage I28 with the interior ofhousing I25. A ball bearing valve I32 is confined for movement in airpassage I28 and is adapted to seat on a shoulder I 33 formed adjacentthe lower end of air passage I28 to close communication between airpassage I28 and the interior of housing I25. An L-shaped fitting I34 isthreaded into the upper end of air passage I23 and connects through anair lead I35 to air line to provide the air needed for operation of theair motor I02. Pressure of the air conducted by air lead I35 to airpassage I28 acts to hold the ball bearing valve I32 normally in seatedposition on its cooperating shoulder I33. To move valve I32 to unseatedposition to establish free passage of the air to the air motor I 62there is afforded a valve pin I35slidably mounted in the lower end ofadapter I21 with its upper end normally positioned below and-spaced fromthe ball bearing valve I32 and its opposite end projected to theexterior of valve housing I25 and resting upon the upper end of anactuating reciprocable plunger I 31 slidably positioned within avertical bore I33 formed in a mounting bracket I4I. A threaded fittingI42 is located in the lower end of bore I38 and is connected to an airlead I43 whereby air pressure may be applied to the bottom of actuatingplunger I31 to effect longitudinal movement upwardly of the plunger I31to actuate valve pin I36 to unseat valve I32. The detailed constructionof air motor I02 and valve assembly I24 constitutes no part of thepresent invention and the construction illustrated in the drawings isunderstood only to be representative of valve controlled air powereddevices that could be employed in this invention.

The air motor I52 is supported in operative position on machine ID bythe mounting bracket I4I which is afiixed to the outer wall of the aircylinder 3I by a plurality of suitable fasteners I351. The mountingbracket I4I is provided adjacent its one end I46 with a vertical boreI44 into which a portion of the casing I2 I of air motor I62 is tightlyfitted to mount the air motor I32 in operative position. Horizontallyspaced from bore I44 is the vertical bore I33 in which is slidablymounted the longitudinally movable actuating plunger I31 which movesvalve pin I36. The opposite end I45 of the mounting bracket MI isadapted to accommodate a valve arrangement I45. Valve arrangement I46comprises an adapter I41 having a threaded engagement with the definingwalls of the upper end of a vertical bore I 48 formed in the mountingbracket Hill. The adapter I41 extends from the top to the bottom ofbracket I4! and is provided with a longitudinal bore I'5I communicatingby way of passages I52 with bore I43.

'A fitting assembly I53 is mounted in the upper end of longitudinal boreI5I and is connected through an air lead I54 with the air lead 45 toprovide a path whereby air may be conducted to bore IESI. The fittingassembly 553 includes a usual pet cock I 55 which permits closure of theair passage through the fitting assembly I53 when desired. A ball valveE55 is disposed for movement within longitudinal bore I5I and has 10 avalve'seat I51 formed in the'bore I'5I adjacent the passages I52. Thepressure of the air introduced within longitudinal bore I5I is adaptednormally to position the valve I56 in its seated position to prevent airpassing from bore I5I- through passages I52 into vertical'bore I48. A-valve pin I58 is slidably positioned at the lower end of adapter I41 andis movable into engage ment with valve I56 to effect-unseating thereof.Movement of valve pin I58 is effected and controlled by a cam actuator I6| to be described. With valve I56 in open position air will freely passinto vertical bore I48 from which it-escapes by Way of a usual hosefitting I62. Hose fitting I62, asbest seen in Figure 2, is located atend I45 of mounting bracket I4I. It is adapted to communicate with boreI46 through a port (not shown) in the wall of the mounting bracket. AT-coupling I63 connects hose fitting I62 to the air lead I43,- which airlead effects operation of the actuating plunger I31-for'valve assemblyI24. The T-coupling I63 also connects to the one end of an air lead I54whose opposite end isfitted to a tubular element I 65 mounted on andprojecting laterally from upper body portion "52 of gear housing 5I. Asseen in Figure 8, the tubular element I65 is disposed on body portion52" so as to locate the bore I66 thereof aligned with the entrance to anarcuate passage I61. This passage I61 empties by way of a'connectingpassage I68 into the space defined by the interior wall surfaces ofannular flange 33, which flange 93 depends from lower body portion 53;The air provided to this space is adapted to be'directed at the area ofthe work-piece being drilled by cutting tool 15 and serves to blow thechips formed in the perforating operation away from the tool 15. It ishere noted that when air is passed by valve I56 to the'hose fitting I62,such air is directed simultaneously to. both the air leads I43 and I64.The purpose of air lead I43 is to provide the-pressure necessary to moveactuating plunger I31 upwardly to unseat valve I32 thereby to dischargeair into casing I2I of air motor I52, for the operation of itsair vanesI22 to rotate drive shaft assembly I03 and thereby actuate cutting tool15. The air fedthrough the second air conduit I64 will play upon cuttingtool 15 throughout its period of drilling operation and until valve pinI53 permits re-seating of valve I 56 to block further passing of' air tothe two air lines I43 and I64.

As described hereinbefore the air cylinder 3! through reciprocalmovement of its piston 32 effects reciprocal movement of the plunger I1.Plunger I1 is adapted to bottom in recess IIII of adapter 38 to move thedrilling unit 2| to the work-piece. Washer 36 provided by gaging means83 of drilling unit 2I will contact the work-piece first and rotatingcutting tool 15 will follow, passing through the central opening 89 inwasher 33 to perforate the work piece. The gaging means 83 determinesthe depth of the opening and of the countersink to be formed in the workpiece. Engagement of the washer 68 by the opposed pairs of legs 3iprojecting from the lower end of ring 64 determines the amount ofadvance of the cutting tool 15 into the workpiece; zith this engagementany further movement a; the housing 51 carrying the cutting tool 15 inthe direction of the work piece is halted. Application of excessivedownwardly directed pressure by piston 32 and plunger I1 upon housing 5!of drilling unit 2i after the depending legs 5-H have contacted thewasher 38 11 is prevented by the provision of a piston stop assembly I69operatively supported within the air cylinder 3!. Piston stop assemblyI69, as best seen in Figure 4, comprises a pivotally mounted platemember I'IB movable between a horizontal, or inactive position, and avertical, or piston stopping, position. Piston 32 when forced down byair pressure is adapted to engage with the upraised plate member I'IBwhereupon its further downward movement is prevented. A reciprocatinglinkage assembly III is operatively connected to the pivotal platemember I for effecting movement thereof. The reciprocating linkageassembly III is operated by a rotatable shaft I'I'2 which is driven byan actuator assembly I13 to be described. However, even though itsadvance is stopped, the cutting tool I5 will continue to rotate. Toconclude this rotating action of the cutting tool I5 and to return thedrilling unit 2I to inoperative position there is provided aconventional self-contained, normally open, snap switch assembly I'M, ofthe microswitch type. The switch assembly I14 is mounted upon anextension I15 of the upper body portion 52 of housing 5!. assembly H4 isprovided with an externally threaded projection I'IE which is fittedthrough an opening IT! in extension I15 and receives a nut I18 whichserves to fasten the switch assembly IIII securely to the housing 5I.I79 provided for operating switch assembly I'M projects below extensionI15 and carries an elongated supporting member IBI transversely disposedand underlying extension I15. Elongated member I8I mounts a stud I82which is threaded therethrough, and which has its shank I83 disposed forfree slidable movement within an opening I84 in extension I15 and hasits lower end I85 disposed spaced from the transverse elongated memberISI. It is seen that as housing 5| of the drilling unit 2| is carriedtoward the work piece the switch assembly I14 supported by it and theupstanding stud I82 supported by the switch actuator I79 are also movedin the same direction. This movement will bring the lower end I85 of thestud I82 into engagement with the surface of the work piece. Stud I82will thereupon exert force upon the transverse member I8I to move itupwardly away from the surface of the work piece. This movement will betransmitted to the switch actuator I'I9 to cause it to move to operateswitch II I. Switch I'M is suitably electrically connected to electricmeans, not shown, associated with the shift cylinder assembly 43 tocause it to function so as to bleed the main control valve 1 and exhaustair cylinder 3|, whereupon piston 32 is returned to its rest positionunder the bias of compression spring 35, and plunger I'I withdraws fromthe adapter 93. With release of the pressure of plunger I'I therefromthe drilling unit 2I will be carried upwardly away from the work pieceby support arm 22 and its shaft 23, the shaft 23 moving upwardly underspring bias. Stud I32 by reason of its threaded connection withextension II5 can be readily rotated to adjust the position of its lowerend I85 and thus change the time of actuation of switch I'M as desired.

The shift cylinder assembly 43 functions also to operate the camactuator IEI, as will be described in further detail, to cause valve Ito close and disconnect the air lead I64 from the air supply whereuponthe air motor I02 ceases to function and the cutting tool I5 stopsrotating.

As stated hereinbefore valve I56 which con- The casing of switch Anactuator trols the feeding of air used to drive air motor I02 and toblow chips away from the cutting tool I5 is itself controlled by a camactuator I6I, whose construction is best illustrated in Figures 12 and13. Cam actuator I6I comprises a generally U-shaped member I86comprising spaced legs I81 and having an outwardly projecting generallyarcuate portion I88 located adjacent the bight I89 thereof. Theprojecting portion I88 has an inclined surface I9! formed thereon uponwhich the lower end of valve pin I58 rests. It is apparent that as camactuator IBI is oscillated to shift the position of inclined surface I9Irelative to the valve pin I58 the latter is made to ride up and downthis inclined surface and will be given a reciprocating movement towardand away the ball bearing valve IE6. Pin I58 will displace valve I56from its seat I5! when raised high enough to engage valve I58, and willpermit valve I56 to assume its seated position when the inclined surfaceISI moves in a direction to permit pin I58 to fall in its bore to liespaced from the valve I55.

Oscillating movement of cam actuator I6I to effect reciprocation ofvalve pin I58 is obtained through an elongated member I32, a portion ofwhich lies disposed between the legs I8! of cam actuator I6I and issecured thereto by a number of studs I93. The elongated member I92 ispivotally joined, at its end I911 by a pivot pin I95 to a clevis I96provided at the exterior end of a reciprocating connecting rod I97. Theconnecting rod I9? is suitably attached to the pulley and cablearrangement 44 controlled by the shaft cylinder assembly 43 and throughwhich cable and pulley arrangement 65 reciprocating action of theconnecting rod I91 is obtained.

Adjacent embraced end I98 of the elongated member I92 is provided anopening I99 into which is tightly fitted the lower end 280 of the shaftI'I2. Shaft I12, as stated hereinbefore, is operatively connected to thereciprocating linkage assembly III in air cylinder IN to actuate pistonstop plate member IIU between its horizontal and vertical positions.

Provided substantially centrally in elongated member I92 is a secondopening Zill into which is adapted to project the free end 282 of anoscillating member 283, whose opposite end is suitably rotatablymounted. Free end 292 fitting into opening 2IlI effects a pivotalconnection between elongated member I92 and oscillating member 283. Withthe construction described the elongated member I92 upon having its endI94 actuated by reciprocating rod I91 will, through its opposite endI98, rotate shaft I'I2 to operate reciprocating linkage III to raise andlower the piston stop plate member I10 and will oscillate cam actuatorIEI to shift the position of inclined surface I9I on cam actuator IBI toeffect reciprocating movement of valve pin I58. The movement of valvepin I58 riding on cam actuator I6 is coordinated with the movement ofthe piston stop plate member I10 by means of elongated member I92 andcam actuator I6I. Valve pin I58 will be actuated by inclined surface I91of cam actuator IBI into valve opening position as shaft IIZ affixed tocam actuator I6I rotates to operate reciprocating linkage III to raiseplate member I10 into piston stopping position, and valve pin I58 willrest in its inactive position on inclined surface I9I at the time thatplate member I'ID assumes a horizontal position.

In the formation of rivet holes by drilling in metal sheets broughtadjacent one another there 13 exists a. likelihood that dust particlesand fine chips created by the drill may sift between. the sheets andhold. the adjacent surfaces thereof out of contact with one another andthereby tend to prevent the obtainment of a fully effective rivetedjoint. The present invention provides an attachment for use with machineit which functions to maintain the work parts in desired closeengagement as they are being perforated and riveted. This attachmentcomprises, as best illustrated in Figures 16 and 17, a hold-downassembly295 which includes an elongated clamping member 2535 bent to effect anobtuse angle defined by a portion Zill inclined to a portion 208. Theinclined portion. 2% is pivotally connected, at its end 239, by a pivotpin 2, to a bracket 212 which is securely fastened by studs M3 to theunderface of yoke jaw 13. To effect pivotal movement of clamping member2'33 there isprovided a conventional air cylinder 2M which is mountedupon the underface of yoke jaw l3 by studs 225. The air cylinder 264includes a usual reciprocab-l'e piston (not shown) which. actuates apiston rod 2H5, the end of which projects from the bottom of thecylinder 2H3. The piston rod 216 has a lost motion connection withportion 2528 of the clamping member 295', which lost motion connectionis efiected by a stud 2 i '2' whose shank is passed through a slottedopening 213,

provided in portion 238 of elongated member 296,

and threaded into the bottom end of piston rod 2E6. An air conduit 220,connected at one end to air cylinder 2M and at the other to" air lead M,provides the power for operation of air cylinder 2! to move the .pistonrod 2H3 to actuate the clamping member 2% and press portion 293 thereoftightly against the upper surface of the work to hold the-two adjacentpieces of material comprising the work in firm engagement during theperforating and riveting operations. The hold down assembly 2655- islocated adjacent plunger ll andis movable in the same plane as isplunger l? to clamp the work piece in the area immediately surroundingthe spot to be perforated and riveted.

Portion 233' of pivc" d clamping member 7266 has its outer end 2% formedgenerally into a U-shape comprising two legs 22% and-2E2 spaced apart,with leg 22? being of a smaller length than opposite leg 222. legs 22!.222, to lie disposed on opposite sides of plunger ii. These legs 22? and222* lie .positioned on opposite sides of the cutting tool lE-and itsassociated gage means 83 when the drilling unit is moved into positionfor engagement and actuation by plunger 6?. The disparity in length oflegs 221 and 222is necessary to-prevent interference with the swingingmovement of the drilling unit El to and from its position beneathplunger. it. The projection of shorter: leg 22! would-liein the path ofmovement of cutting tool l5. Having a shorter length provided for leg225 permits the drilling unit 2% to swing freely past the end thereof.Rivet shoe 2 2 is normally so positioned that it lies disposed above thelonger leg 222 and therefore when swinging into. and out of position forcooperation. with plunger I? it passes over leg 222 without interferencebeing offered to its freedom oi'movement by leg 222.

The cylinder is provided with a laterally projecting he ge flts'adjacentits lower end. An adjusting stu'o .1? is threadedinto flange 223 andextends to either side thereof. Stud'224 carriesa look nut 225.011 oneside to fix theposition of thestud 22s,; and has one end: adapted to. en

Clamping member projects I4 gage portion 298 of clamping membenZtli- Thestud 225 permits adjustment of the position of portion 289 relativetoair cylinder 214. 1

The anvil assembly i8: supports the work piece 28. as it is beingperforated and riveted. It is of conventional construction, and, as seenin Figure 1 comprises a frame 2-28 carryinga usual anvil support 221 Theanvil supp'ort'22'l mounts a reciprocable generally U-shaped strippersaddle memberZZil havingspaced'legs 229 and 23llwhich are disposedwithin cylinders 23!, shown in dotted outline, provided by frame 226 andanvil support 22?. Air is provided to these cylinders 23! by a: lead 232extending frcmregulator valve 46; This air is adapted to act upon thebottom surfacesof legs 22s and 288 to move thestrippersaddle member 223'into its upper position as shown in Figure 14'.

An air lead 233v is connected at one end; as illustrated in Figure 15',to bight 234 of thestripper saddle member 223 to provide air to achamher235 located in the bight 234, which air is used for blowing away drillchips formed during the perforating operation aswill befu-rtherdescribed Air lead is connected at its other end. to. air leadll from which it obtainsthe air which is supplied to chamber 235.

An anvil post 236 is suitably mounted by anvil support 22! and projectsupwardly therefrom to extend into a bore 23-1 provided in a reciprocablymovable work supporting stripper member 238 to guide the latter in itsmovements" and to serve to head the rivets. Stripper member 238 restsits lower end 239' upon the top of stripper saddle member 228 and isbodily movable there'- with relative to anvil post 236 during theriveting operation. The purpose of the stripper is to support the workpiece as it is being operated upon. It will hold the work piece spacedfrom the top of anvil post 236'in order that the shank of a rivet mayextend through the workiprior to being headed. Air pressure normally iscontinuously provided by regulator valve 48* through air lead 232 to thecylinders 23'! to act onlegs- 229 and 230 of the stripper saddle 228to'raisethe stripper member 238' to the position shown in Figure M tohold it inproper relationship to the drilling unit 2i and rivet shoe 24.In. the performance of the riveting operation the pressure provided uponthe upper surface of work piece 28 by rivet shoe 24 and top set orplunger I! will cause the stripper member 238 to move downwardly andrelative to the anvil post 235.

Stripper member 238 has a vertical bore 242 providedtherein whichconnects its upper surface with air chamber 235-where-by air canbe'led'from the chamber 235 to exit at the bottom of the workpiecerested onstripper member 238' to blow away any drill chips whichiappearupon the work supporting stripper member 238. Slidably positioned withina through bore 244 in" anvil post 236' and extending. downwardly into analigned bore 245- in anvil support 221 is a locating pin member 246, aslidably movable adapter 253'upon the upper end of which pin member 245"rests, and a stop member 25! having abore 25lltherein. A spring 241 isdisposedwithin stop member bore 250 and acts upon the-lower end oflocating pi'n member 246, exerting its bias thereupon-normal- 1y torprojectthe upper end zlisthereof abovethe top of anvil. post 23-6 and.above the stripper member- 238. The upper end 248 of pin member 246 willlie spaced from the'topof anvil. post 236 and stripper member 238untilxengaged and forced downwardly either b'y the unde'r surface of awork piece or by the end of a rivet shank. The locating pin member 246is positioned and held by anvil post 236 in axial alignment with cuttingtool 15 and therefore, after the completion of a drilling operation andthe withdrawal of the cutting tool 15 from the rivet hole formedthereby, the locating pin 246 will be moved upwardly by its spring 241to extend into the rivet hole and thereby hold the perforated work piecein position until a rivet shank is inserted into the rivet hole by theplunger operated rivet shoe 24. The rivet shank will press the locatingpin member 246 downwardly until the top of the pin member 246 lies inthe plane of the top of anvil post 236, at which point a shoulder 249 onthe adapter 253 engages the upper end of stop member to halt furtherlongitudinal downward movement of locating pin 246. Pin 246 thencooperates with anvil post 236 to effect an anvil upon which the rivetshank is headed as additional pressure is applied to the head of therivet by plunger I1.

The anvil assembly I8 may be bodily raised to and lowered from itsoperative position by a mechanism, not shown, housed within frame 226,which mechanism is operated by air pressure provided through air leads252 and controlled by appropriate pedals 39 on foot operated controlmember 31. Provision is made for raising and lowering the anvil assemblyI8 to more readily permit placement of a work piece in proper positionbetween the yoke jaws.

In the operation of the invention a work piece 28 will be placed uponthe stripper member 238 of anvil assembly I8 to rest it in position forperforation and riveting. A pedal 39 on the foot operated member 31 isthen actuated to by-pass air from air supply conduit 38 to the air lead4 I. This air actuates the shift cylinder assembly 43, which in turnactuates the cable and pulley arrangement 44. The cable and pulleyarrangement 44 operates the master control valve 41 to pass air from airconduit 45 through air line 56 into the air cylinder 3| to build uppressure therein to effect downward movement of piston 32 against thebias of spring 35.

The operation of cable and pulley arrangement 44 withdraws reciprocatingrod I91 into the upper jaw I3. Clevis I96 on the end of reciprocatingrod I81 thereupon moves end I94 of elongated member I92 to effectrotative or arcuate movement of the opposite end I98 thereof about theconnection of free end 202 of oscillating member 283 and the elongatedmember I92. This movement of end |98 will rotate shaft I12 to operatethe linkage assembly |1| to raise the piston stop assembly I69 providedwithin air cylinder 3|. The arcuate movement of end I98 of elongatedmember I92 will also move the cam actuator I6| to displace its inclinedsurface |9| relative to the valve pin I58 to cause the latter to ride upthis inclined surface |9I and thereby move upwardly within bore |5I ofvalve adapter I41 to engage ball bearing valve I56 to unseat it. Theunseating of valve I56 allows air to pass from lead I54 and lead 45through the passages l52 to issue through hose fitting I62. From hosefitting I62 this air takes two paths, along one path it is conducted byair lead I64 to the gear housing 5| to discharge through communicatingpassages I66, I61 and I68 into the space defined by annular flange 93whereby a blast of air is provided at the cutting tool 15. The secondpath from the hose fitting I62 is by way of the air lead |43whichconnects to hosefittlng I42 and discharges against the bottom surface ofreciprocable plunger I31 to apply pressure thereagainst for moving itupwardly, longitudinally, within its bore I38. Upward movement ofplunger I31 will move valve pin I36 in the same direction to bring thelatter into engagement with ball bearing valve 32 to move valve I32 offits seat I33. Valve I32 controls the feeding of air required foroperation of the air motor I32. This air i taken from air supply line 38by way of air leads 45 and I35 and is passed to bore I28 in adapter |21.Unseating of valve |32 by valve pin I36 allows the air to flow from boreI28 through passages I31 and tubular member I26 to act upon vaneassembly I22 to effect rotation thereof. Vane assembly I22 drives shaftI66 which in turn rotates drive shaft assembly I03. Rotation of driveshaft assembly I63 will actuate gear train 59 to rotate the cutting tool15. Thus the movement of cam actuator |6| to actuate valve pin I58results in the actuation of air motor I02 to effect rotation of cuttingtool 15 and in the provision of an air blast at the cutting tool 15.

As the pressure in air cylinder 3| builds up the piston 32 is moveddownwardly to move plunger I1 into engagement with adapter 98 carried bygear housing 5| of drilling unit 2|. Continued downward movement ofplunger I1 moves the drilling unit 2| toward the Work piece 28 to bringthe cutting tool 15 upon the work piece 28. The time required to buildup the necessary pressure within air cylinder 3| to move piston 32 andplunger H to perform their function is such that the cutting tool 15 isrotating at its maximum speed before the work piece is contacted. Thisobviously results in a more efiicient cutting operation and applies lessstrain to the operating elements. Also before the cutting tool 15 beginsthe cutting operation the hold-down assembly 265 will have operated toapply a clamping pressure upon the upper surface of the work piece 28.When air is admitted to line 4| to actuate shift cylinder assembly 46 itwill also enter air line 220 which is connected to line 4!. Air line 220will pass this air to air cylinder 2|4 of the holddown assembly 265. Onintroduction of air into air cylinder 2I4 its piston rod 2|6 is actuateddownwardly to effect pivotal movement of clamping member 206 to carrythe U-shaped end of portion 268 into engagement with the upper surfaceof work piece 28. The pressure applied by clamping member 263 willefficiently hold the adjacent parts comprising the work piece tightly inengagement prior to and during the drilling operation.

- After the cutting tool 15 has cut an opening and counter-sink in thework piece 28 to the depth determined by the gage means 83 the lower endI85 of stud I82 engages the upper surfaceof the work piece 23 to effectupward movement of switch actuator I13 to operate the normally open snapswitch I14. Switch I14 on being operated actuates the shift cylinderassembly 43 to exhaust it and cause it to act through the cable andpulley arrangement 44 to bleed the master control valve 51 to exhaustair cylinder 3| to permit the return of piston 32 to its upper position.Upward movement of piston 32 withdraws plunger I1 from engagement withdrilling unit 2|. Upon release of the pressure of plunger I1 shaft 23,which mounts support arm 22 and driling unit 2 I, moves upwardly in thesame direction as plunger I1 to space drilling unit 2| above the workpiece 28. This upward movement of drilling unit 2| withdraws cuttingtool absence from the rivet hole cut by it. As cutting tool 15 withdrawsfrom the rivet hole the upper end 248 of locating pin member 246 isprojected into the rivet hole to hold the work piece in position for theriveting operation. Exhausting the shift cylinder assembly 43 willeffect exhausting of air cyinder 214 of hold-down assembly 205 throughair line 220. Piston rod2I6 will withdraw into air cylinder 2I4 torotate clamping member 206 away from the work piece 28 and release itfrom clamping pressure. The perforating operation is now complete.

In the riveting operation a pedal 39 on the foot controlled member 36 ispressed to feed air through line 42 to again actuate the shift cylinderassembly 43 which again operates the cable and pulley arrangement 44.Cable and pulley arrangement 44 actuates the appropriate linkage foreffecting pivotal movement, in unison, of the support arms 22 and toprovide a substitution in-position of the drilling unit -2I and therivet shoe '24, mov ing'drilling unit 2| out from under plunger I 1 andreplacing it with rivet shoe 24. i

Reciprocating connecting rod I91 will be projected forwardly to moveclevis I96 and rotate the end I98 of elongated member 192 about theconnection of elongated member I32 with the free end 2-02 of oscillatingmember 203. Rotative movement causes rotation of shaft H2 which opcrateslinkage assembly I'll to move piston stop plate member I69 to itslowered position. Rotative movement of end I98- of elongated member I-92also moves the cam actuator ISI to displace its inclined surface I 3-Irelative to the valve pin I58 to cause thelatter to fall so as todisengage from ball bearing valve I56. Valve I56 will then bemoved byair pressure, provided through air leads and I54, to rest on valve seat15! and thereby out off the air supply to hose fitting I62. Air leadsI43 and -IE4 connected to hose fitting I62 will then be shut off. Withair lead 143 closed off there is no pressure available to hold.

plunger I3 1 in its upper position. Plunger I31 will therefore falldownwardly and valve pin 1'36 actuated .by plunger I31 will move in thesame direction to disengage the ballbearing valve -.I 32. Valve I32 willbe :moved by air pressure to seat on shoulder I 33 .tozdiscontinue thefeeding of air from .air lines 135 and 45 to the air motor I32. Airmotor 182 will then cease to function and rotation of drive shaftassembly VI (93 willbehalted. Gear train 59 .willstop and :the cutting.tool .15 will come torest. :With no air being provided to "hose fittingI62 the air blast provided at the cutting tool =15 through air :lead 164is discontlnued.

The cable and pulley arrangement 44. actuated by shift cylinder assembly46 operatesmain valve 41 to pass .air to the air cylinder 3| to effectmovement of piston '32 therein. Plunger I! will be moved bypiston 32to-engage rivet shoe .24to carry it, and the rivet disposed -therein, tothe work piece to dispose the shank of-the rivet in the rivet Tholeformed in (the drilling operation. Plunger l1 and piston 32 willcontinue ---their downward movementunderthe forceof thepressure-builtupin aircylinder 3'I until the shank of the rivet is headed by theanvilassembly I8. After the riveting operation the removal of pressure fromthe lastactuated foot pedal 39 on foot operated control member-37 shutsoff air to shift cylinder assembly 43. Shift cylinder assembly 43 willthen bleed and effect actuation of :the cableand pulley arrangement 44to operate main control valve 4-! to bleed it and eiiect exhaustion ofthe air from air cylinder 3| to return plunger I1 to its neutralposition and disengage it'from the rivet shoe 24. The work piece 28 isthen shifted to a new position on anvil assembly 18 and the drilling andriveting cycle above described is repeated.

While certain preferred embodiments of the invention have beenspecifically disclosed, it is understood that the invention is notlimited thereto as many variations will be readily apparent to thoseskilled in the art and the invention is to be given its broadestpossible interpretation within the terms of the following claims.

What Iclaim is:

1. In a riveting machinehaving a pair of mutually. opposed jaws with .aworkpiece supporting anvilgassembly mounted upon one jaw and a drillingassembly and a rivet holding member, each supported for swingingmovement uponlthe opposite jaw adapted to be alternately positioned oversaid anvil assembly and alternately movable into engagement with a workpiece to be perforated and riveted, said drilling assembly comprising arotary cutting tool and drive means operatively connectedto said rotarycutting tool for rotating it, clamping means operatively mounted on saidjaw which supports said drilling assembly and said rivet holdingmember-adaptedto move toward the anvil assembly supporting jaw tocontactand press upon the work piece prior to and during perforation thereof bythe rotary' cutting tool, said clampingmeans comprising an elongatedmember having one end pivotally "secured tothe jaw supporting thedrilling assembly, anaircylinder having a piston movable toward and awayfrom the work piece, and means effecting a lost motion connectionbetweenthe piston and said elongated member whereby said elongatedmember is movable to the work piece tob'ring its free end into clampingengagement therewith, and a locating pin member slidably "supported bysaid anvil a'ssemblyadapted to move into an opening cut into the workpiece upon withdrawal of the rotary cutting tool and the elongated meber therefrom.

2. In a riveting machinehaving a frame with a pair of spaced apart arms,a work piece supporting assembly provided.upon one arm,"a drillingattachment movably mounted onthe opposed arm adapted to be advanced andretracted rel ative-to a work piece to beperforated, saididriilingattachment comprising a housing, a [cutting tool rotatively supportedbysaid housing, ageartrain carried by said housing operatively connectedto said cutting tool forrotating it, means for actuating said'gear trainto rotate said cutting tool before its en agement with awork piece, saidmeans comprising motor driven means having fa connection with the geartrim for actuation thereof, gage means supportedinfassociation with saidhousing and operativ to "determine the depth of perforation of 'the workpie-c by the cutting tool, said isage means comprisinga ring membermovablyniounted' "on said housing "in encircling relationship to-thecutting tool, and means for providingan airblast 'atth cutting tooleffective to ;blow away dust' particles created by the cutting tool-inperforating the' work piece, said means comprising a tubular membersupported bysaid housing having a connection with a source ofairsupply,said-ho'using having passages therein interconnecting saidtubularelement and the area defined by the ring; member, into whichareaair may be passed I w actoKthe' 19 area of the work piece beingperforated by the cutting tool.

3. In a riveting machine having a pair of mutually opposed jaws, onedisposed above the other, with a work piece supporting assembly mountedupon the lower jaw and a drilling assembly and a rivet holding membermovably supported in association with the upper jaw, said drillingassembly and rivet holding member adapted alternately to advance to andwithdraw from a work piece to be perforated and riveted, said drillingassembly comprising a housing, a cutting tool rotatively supported bysaid housing, and a gear train carried by said housing operativelyconnected to said cutting tool for rotating it, a motor mounted on saidupper jaw, a drive shaft assembly operatively interconnecting said motorand said gear train, means for operating said motor to effect actuationof said drive shaft assembly and said gear train prior to said cuttingtool engaging the work piece, said drive shaft assembly comprisingtelescopic means, a universal joint connecting one end of saidtelescopic means to said motor, and a second universal joint connectingthe opposite end of said telescopic means to said gear train, andclamping means operatively mounted on the upper jaw adapted to contactand press upon the work piece prior to perforation thereof by thecutting tool.

4. In a riveting machine having a frame with a pair of spaced arms, onedisposed above the other, with a work piece supporting assembly mountedupon the lower arm and a drilling assembly and a rivet holding membermovably supported in association with the upper arm, said drillingassembly and rivet holding member adapted alternately to advance to andwithdraw from a work piece to be perforated and riveted, said drillingassembly comprising a housing, a cutting tool rotatively supported bysaid housing, a gear train carried by said housing operatively connectedto said cutting tool for rotating it and means for providing an airblast at the cutting tool effective to blow away dust particles createdby the cutting tool in perforating the work piece, said means comprisingan air lead-in member supported by the housing adapted to communicatewith passages provided by said housing, which passages direct air to thearea of the work piece being perforated by the cutting tool, an airmotor mounted on said upper jaw, a drive shaft assembly operativelyinterconnecting said air motor and said gear train, valve means forcontrolling the feeding of air to said air blast means and to said airmotor, means for actuating said valve means to feed air to said airmotor to effect operation of said cutting tool prior to its engaging thework piece, and clamping means operatively mounted on the upper jawadapted to contact and press upon the work piece prior to perforationthereof by the cutting tool.

5. In a riveting machine having a pair of mutually opposed jaws, onedisposed above the other, with a work piece supporting assembly mountedupon the lower jaw and a drilling assembly and a rivet holding membermovably supported in association with the upper jaw, said drillingassembly and rivet holding member adapted alternately to advance intoand withdraw from a work piece to be perforated and riveted, saiddrilling assembly comprising a housing, a cutting tool rotativelysupported by said housing, a gear train carried by said housingoperatively connected to said cutting tool for rotating it, and meansfor providing an air blast at the cutting tool effective to blow awaydust particles created by the cutting tool in perforating the workpiece, said means comprising an air lead-in member supported by thehousing adapted to communicate with passages provided by said housing,which passages direct air to the area of the work piece being perforatedby the cutting tool, an air motor mounted on said upper jaw, a driveshaft assembly operatively interconnecting said motor and said geartrain for actuating said gear train prior to said cutting tool engagingthe work piece, said drive shaft assembly comprising telescopic means, auniversal joint connecting one end of said telescopic means to saidmotor, and a second universal joint connecting the opposite end of saidtelescopic means to said gear train, valve means mounted on said framefor controlling the feeding of air to said air blast means and to saidair motor, means for actuating said valve means to feed air to said airmotor to effect operation of said cutting tool prior to its engaging thework piece, and clamping means operatively mounted on the upper jawadapted to contact and press upon-the work piece prior to perforationthereof by the cutting tool.

6. In a riveting machine having a frame with a pair of spaced apartarms, one disposed above the other, a work piece supporting assemblyprovided upon the lower arm, a drilling attachment movably mounted onthe upper arm adapted to be advanced and retracted relative to a workpiece to be perforated, said drilling attachment comprising a housing, acutting tool rotatively supported by said housing, a gear train carriedby said housing operatively connected to said cutting tool for rotatingit, means for actuating said gear train to rotate said cutting toolbefore its engagement with a work piece, said means comprising motordriven means having a connection with the gear train for actuationthereof, gage means supported in association with said housing andoperative to determine the depth of perforation of the work piece by thecutting tool, said gage means comprising a ring member movably mountedon said housing in encircling relationship to the cutting tool, meansfor providing an air blast at the cutting tool effective to blow awaydust particles created by the cutting tool in perforating the workpiece, said means comprising an air lead-in member supported by thehousing, said housing having passages therein interconnecting said airlead-in member and the area defined by the ring member, into which areaair may be passed to act upon the area of the work piece beingperforated by the cutting tool,

and clamping means operatively mounted on the upper arm adapted tocontact and press upon the work piece prior to perforation thereof bythe cutting tool.

7. In a riveting machine having a pair of mutually opposed jaws, onedisposed above the other, with a work piece supporting assembly mountedupon the lower jaw and a drilling assembly and a rivet holding membermovably supported in association with the upper jaw, said drillingassembly and rivet holding member adapted alternately to advance to andwithdraw from a work piece to be perforated and riveted, said drillingassembly comprising a housing, a cutting tool rotatively supported bysaid housing, a gear train carried by said housing operatively connectedto said cutting tool for rotating it, gage means supported inassociation with said housing and operative to determine the depth ofperforation of the work piece by the cutting tool,

. housing, said housing having passages therein interconnecting said airlead-in member and the space defined by the ring member, into whichspace air may be passed to act upon the area of the work piece beingperforated by the cutting tool, an air motor mounted on said upper jaw,a drive shaft assembly operatively interconnecting said motor and saidgear train, valve means for controlling the feeding of air to said airblast means and to said air motor, means for actuating said valve meansto feed air to said air motor to effect operation of said cutting toolprior to its engaging the work piece, and clamping means operativelymounted on the upper jaw adapted to contact and press upon the workpiece prior to perforation thereof by the cutting tool.

8. In a riveting machine having a pair of mutually opposed jaws, onedisposed above the other, with a work piece supporting assembly mountedupon the lower jaw and a drilling assembly and a rivet holding membermovably supported in association with the upper jaw, said drillingassembly and rivet holding member adapted alternately to advance to and.withdraw from a work piece to be perforated and riveted, said drillingassembly comprising a housing, a cutting too1rotative1y supported bysaid housing, a gear train carried by said housing operatively connectedto said cutting tool for rotating it, gage means supported inassociation with said housing and operative to determine the depth ofperforation of the work piece by the cutting tool, said gage meanscomprising a ring member movably mounted on said housing in encirclingrelationship to the cutting tool, means for providing an air blast atthe cutting tool effective to blow away dust particles created by thecutting tool in perforating the work piece, said means comprising an airlead-in member supported by the housing, said housing having passagestherein interconnecting said air lead-in member and the space defined bythe ring member, into which space air may be passed to act upon the areaof the work piece being perforated by the cutting tool, an air motormounted on said upper jaw, a drive shaft assembly operativelyinterconnecting said motor and said gear train, said drive shaftassembly comprising telescopic means, a universal joint connecting oneend of said telescopic means to said motor, and a second universal jointconnecting the opposite end of said telescopic means to said gear train,valve means for controlling the feeding of air to said air blast meansand to said air motor, means for actuating said valve means to feed airto said air motor to effect operation of said cutting tool prior to itsengaging the work piece, and clamping means operatively mounted on theupper jaw adapted to provide a clamping pressure upon the work pieceprior to perforation thereof by the cutting tool, said clamping meanscomprising an air cylinder having a piston movable toward and away fromthe work piece, an elongated member having one end pivoted to said upperjaw, and means interconnecting said elongated member and said pistonwhereby said elongated member is movable to the work piece to bring itsfree end into clamping engagement therewith.

FRANK A. BOYLE.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,431,749 Newman Oct. 10, 19222,216,403 Oeckl et a1 Oct. 1, 1940 2,290,440 Lindstrom July 21, 19422,454,596 Dawson Nov. 23, 1948 2,488,645 speller et al Nov. 22, 1949

